Modelling of a hydraulically actuated four bar loading dock lift

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Abstract
The objective of this work is to explore the use of a four bar mechanism for a dock lift. A conceptual CAD model of a loading dock lift incorporating a four bar mechanism is implemented. The mass and moment of inertia of the links and the lift platform are not taken into account at this stage and the emphasis is on implementation of the model and its kinematic analysis. The model is implemented in Simscape using multibody and fluid tools. The kinematic analysis of the multibody system is performed by modelling a bidirectional hydraulic actuation system for the lift in Simscape. The Simscape modelis simulated to evaluate displacements of the lift platform for the given spool valve positions and used to study the control of the continuous and stepped movement of the lift by the directional valve. The model is shown to be successfully implemented, paving the way for future inclusion of dynamic aspects.

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